Industrial Engineering and Production Management
Travel charts provide

The information for changes required in rearranging material handling equipment
An approximate estimate of the handling which must be done at a particular station
A compact estimate of the handling which must be done between various work sections
An idea of the flow of materials at various stages

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Industrial Engineering and Production Management
Pessimistic time is

The maximum time which an activity might require
The average time required for a job
The minimum time in which an activity can possibly be accomplished
The most probable time considering all conditions

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